Matter and its Composition
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Kinetic Theory of Matter
SubtopicKinetic Theory of Matter under Matter and its Composition for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which of the following is an example of a liquid?
A.Oxygen
B.Mercury
C.Steel
D.Sulphur
- 2.
When a gas is compressed, what happens to its particles?
A.They become larger
B.They come closer to each other
C.They stop moving
D.They turn into atoms
- 3.
Which of the following describes the shape of a solid?
A.Takes the shape of the container
B.Has a definite shape
C.Changes shape easily
D.Has no shape
- 4.
The distance between the centers of two molecules is generally greater in:
A.Iron
B.Water
C.Air
D.Copper
- 5.
According to the kinetic theory, what is 'matter' made of?
A.Large continuous blocks of energy.
B.Very tiny particles like atoms and molecules.
C.Empty space with no particles.
D.Visible grains only.
- 6.
A substance is found to have high compressibility and no definite volume. Which of the following could be that substance?
A.Common Salt
B.Orange Juice
C.Carbon Dioxide
D.Gold Ring
- 7.
What happens to the intermolecular force of attraction when a substance changes from liquid to gas?
A.It becomes negligibly small.
B.It becomes very strong.
C.It remains unchanged.
D.It increases to hold the molecules together.
- 8.
Which of the following statements about the 'latent heat of vaporization' is true according to kinetic theory?
A.It is the energy used to increase the temperature of the gas.
B.It is the energy used to increase the speed of the gas molecules.
C.It is the energy used to completely break the intermolecular bonds and increase intermolecular space.
D.It is the energy released when a liquid turns into a gas.
- 9.
If you reduce the volume of a gas to half while keeping the temperature constant, the pressure doubles. How does the kinetic theory explain this?
A.The molecules move twice as fast.
B.The molecules become twice as heavy.
C.The number of molecular collisions per unit area of the wall per second doubles.
D.The intermolecular forces double in strength.
- 10.
Why is it that we can easily move our hand through air, but not through a solid block of wood?
A.Air molecules have zero mass.
B.Air has large intermolecular spaces and negligible forces, while wood has tightly packed particles with strong forces.
C.Wood is made of atoms, while air is not.
D.Air molecules move away from the hand due to magnetic repulsion.
Download the worksheet for Matter and its Composition - Kinetic Theory of Matter to practice offline. It includes additional chapter-level practice questions.
States of Matter
SubtopicStates of Matter under Matter and its Composition for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which of the following will have the least intermolecular space?
A.Water
B.Oil
C.Copper wire
D.Air
- 2.
As the temperature of a substance increases, its kinetic energy:
A.Decreases
B.Increases
C.Stays constant
D.Becomes zero
- 3.
A balloon expands when air is blown into it because:
A.Air has no mass
B.Air occupies space
C.Air has a fixed shape
D.Air molecules do not move
- 4.
Which state of matter has the most ordered arrangement of particles?
A.Gas
B.Liquid
C.Solid
D.Plasma
- 5.
Why does a balloon expand when you blow air into it?
A.The air molecules exert pressure on the walls of the balloon.
B.The air molecules are heavy and pull the balloon down.
C.The rubber of the balloon reacts chemically with air.
D.The air molecules create a vacuum inside.
- 6.
The temperature at which a solid begins to melt is called its melting point. At this temperature:
A.The kinetic energy overcomes the strong intermolecular forces of the solid.
B.The molecules lose all their energy.
C.The intermolecular space becomes zero.
D.The mass of the substance increases.
- 7.
Which of the following is a characteristic of a molecule of matter?
A.It is always visible to the naked eye.
B.It is in a state of continuous motion.
C.It does not have any mass.
D.It is always stationary unless a force is applied.
- 8.
In the provided flowchart, the transitions between three states of matter (A, B, and C) are shown. Transition 'A to C' is known to be Sublimation, and Transition 'B to A' (Transition Y) involves the release of heat energy. Based on this information, which of the following correctly identifies the three states and describes the change in the strength of the intermolecular force of attraction () during the transition from State C to State B?
A.State A: Solid, State B: Liquid, State C: Gas; increases during the transition from C to B
B.State A: Gas, State B: Liquid, State C: Solid; decreases during the transition from C to B
C.State A: Solid, State B: Gas, State C: Liquid; increases during the transition from C to B
D.State A: Liquid, State B: Solid, State C: Gas; remains constant during the transition from C to B
- 9.
When salt is dissolved in water, the level of water does not rise significantly. What does this indicate about the nature of matter?
A.Salt molecules are smaller than water molecules
B.Matter is continuous and has no space
C.There are spaces between water molecules where salt particles fit
D.Water molecules compress when salt is added
- 10.
Dry ice (solid ) is stored under high pressure. If the pressure is reduced to 1 atmosphere, it:
A.Turns into liquid
B.Turns directly into gas
C.Explodes into oxygen and carbon
D.Remains in the solid state
Download the worksheet for Matter and its Composition - States of Matter to practice offline. It includes additional chapter-level practice questions.
Change of State
SubtopicChange of State under Matter and its Composition for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which state of matter has the least intermolecular space?
A.Liquid
B.Gas
C.Solid
D.Steam
- 2.
When wax melts, it changes from a solid state to a:
A.Gaseous state
B.Liquid state
C.Vapor state
D.Plasma state
- 3.
Matter is defined as anything that has mass and occupies:
A.Weight
B.Space
C.Color
D.Time
- 4.
What happens to the molecules of a liquid when it is cooled to its freezing point?
A.They move faster
B.They move further apart
C.They slow down and come closer
D.They disappear
- 5.
When a substance changes its state from solid to liquid, it is considered a:
A.Chemical change because new substances are formed.
B.Physical change because the chemical composition remains the same.
C.Chemical change because energy is absorbed.
D.Physical change because the mass of the substance changes.
- 6.
Which property is characteristic of the liquid state of matter?
A.Definite shape and definite volume
B.No definite shape and no definite volume
C.Definite volume but no definite shape
D.Definite shape but no definite volume
- 7.
When butter is taken out of the refrigerator and kept in the sun, it turns into a liquid. This is an example of:
A.Solidification
B.Fusion
C.Sublimation
D.Vaporization
- 8.
In the context of Matter, what is 'Absolute Zero' ()?
A.The temperature where all substances turn into solids.
B.The temperature where all substances turn into gases.
C.The theoretical temperature where all molecular motion stops.
D.The freezing point of all known liquids.
- 9.
The process where the surface of a solid is converted into a gas is called 'Sublimation'. Which of these is an example of 'Reverse Sublimation' or 'Deposition'?
A.Water turning into ice in a freezer.
B.Steam turning into water on a lid.
C.Formation of frost on cold grass during winter nights.
D.Camphor disappearing in an open bowl.
- 10.
Volatile liquids like ether or petrol feel cold on the palm because:
A.They have a very low temperature in the bottle.
B.They react with the skin to produce a cooling sensation.
C.They evaporate rapidly at room temperature by taking latent heat from the palm.
D.They are good insulators of heat.
Download the worksheet for Matter and its Composition - Change of State to practice offline. It includes additional chapter-level practice questions.
Law of Conservation of Mass
SubtopicLaw of Conservation of Mass under Matter and its Composition for Grade 7 ICSE.
Preview questions (no answers)
- 1.
If you combine of sodium and of chlorine in a closed vessel, the mass of the sodium chloride produced will be:
A.B.C.D. - 2.
Which of the following would NOT be a good way to test the Law of Conservation of Mass?
A.Reacting two liquids in a sealed flask
B.Dissolving sugar in a closed bottle of water
C.Burning wood in an open campfire
D.Melting ice in a Tupperware container
- 3.
In an experiment, of sugar is heated until it turns into black charcoal and water vapor. If the water vapor produced is , how much charcoal is left?
A.B.C.D. - 4.
When coal is burned, the sulfur in it reacts with oxygen to form sulfur dioxide. If of sulfur reacts with of oxygen, how much sulfur dioxide is produced?
A.B.C.D. - 5.
If of Reactant A reacts with of Reactant B to produce of Product C and some amount of Product D, calculate the mass of D.
A.B.C.D. - 6.
Which statement best summarizes the Law of Conservation of Mass?
A.Mass of reactants is always greater than products
B.Matter is lost in every chemical reaction
C.The total mass of products is equal to the total mass of reactants
D.Mass can be converted into space
- 7.
A sealed glass tube contains of phosphorus and some air. The tube is heated until the phosphorus burns. The mass of the tube after the reaction will be:
A.Higher than before
B.Lower than before
C.Unchanged
D.Zero
- 8.
A student performs a reaction in a sealed plastic bag. The bag contains of liquid and of powder. After the reaction, a gas is produced and the bag inflates. If the bag itself weighs , what is the total mass of the inflated bag?
A.B.C.D. - 9.
If of a substance reacts with of substance to produce of substance and some gas, what is the mass of the gas released?
A.B.C.D. - 10.
A sample of Iron reacts with of Sulfur. If the total mass of the system remains throughout the reaction in a closed flask, which statement is true?
A.Only the physical state of the matter changes.
B.The number of atoms in the flask is higher after the reaction.
C.The total mass of the products equals the total mass of the reactants.
D.Sulfur is converted into energy.
Download the worksheet for Matter and its Composition - Law of Conservation of Mass to practice offline. It includes additional chapter-level practice questions.